I'll chime in for (potential) help with the Harmony if you are using ogiewon's "Logitech Harmony Hub Parent" custom driver
If a given Activity is active, then the virtual switch is "on", if it's not active (another is active), then it's "off"
So in all your activities, only one can be on at once.
So i'm not sure how you want the Harmony in the mix above with your rule, but at the top you'd check "if this activity is on, then do or don't do this" (Rule Action > Conditional > Switch > Harmony Activity "movie" is on/off
I could be concise if i understand what you were trying to do more clearer